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| TL431, TL431A ADJUSTABLE PRECISION SHUNT REGULATORS SLVS005L - JULY 1978 - REVISED AUGUST 2000 D D D D D D Equivalent Full-Range Temperature Coefficient . . . 30 ppm/C 0.2- Typical Output Impedance Sink-Current Capability . . . 1 mA to 100 mA Low Output Noise Adjustable Output Voltage . . . Vref to 36 V Available in a Wide Range of High-Density Packages D PACKAGE (TOP VIEW) CATHODE ANODE ANODE NC 1 2 3 4 8 7 6 5 REF ANODE ANODE NC P OR PW PACKAGE (TOP VIEW) description The TL431 and TL431A are three-terminal adjustable shunt regulators with specified thermal stability over applicable automotive, commercial, and military temperature ranges. The output voltage can be set to any value between Vref (approximately 2.5 V) and 36 V with two external resistors (see Figure 17). These devices have a typical output impedance of 0.2 . Active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacements for Zener diodes in many applications, such as onboard regulation, adjustable power supplies, and switching power supplies. The TL431C and TL431AC are characterized for operation from 0C to 70C, and the TL431I and TL431AI are characterized for operation from -40C to 85C. CATHODE NC NC NC 1 2 3 4 8 7 6 5 REF NC ANODE NC DBV PACKAGE (TOP VIEW) NC NC CATHODE 1 2 3 5 4 ANODE REF NC - No internal connection KTP PACKAGE (TOP VIEW) CATHODE ANODE ANODE REF LP PACKAGE (TOP VIEW) CATHODE ANODE REF PK PACKAGE (TOP VIEW) REF ANODE CATHODE Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Copyright (c) 2000, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 1 TL431, TL431A ADJUSTABLE PRECISION SHUNT REGULATORS SLVS005L - JULY 1978 - REVISED AUGUST 2000 AVAILABLE OPTIONS PACKAGED DEVICES TA SMALL OUTLINE (D) TL431CD TL431ACD TL431ID TL431AID SOT-23 (DBV) PLASTIC FLANGE MOUNT (KTP) TL431CKTPR TO-226AA (LP) TL431CLP TL431ACLP TL431ILP TL431AILP PLASTIC DIP (P) TL431CP TL431ACP TL431IP TL431AIP SOT-89 (PK) SHRINK SMALL OUTLINE (PW) TL431CPW TL431Y TL431IPKR CHIP FORM (Y) 0C to 70C -40C to 85C TL431CDBVR TL431IDBVR TL431CPKR The D and LP packages are available taped and reeled. The DBV, KTP, and PK packages are only available taped and reeled. Add the suffix R to device type (e.g., TL431CDR). Chip forms are tested at TA = 25C. symbol REF ANODE CATHODE functional block diagram CATHODE REF + _ Vref ANODE equivalent schematic CATHODE 800 REF 150 3.28 k 2.4 k 7.2 k 20 pF 4 k 10 k 800 20 pF 1 k 800 ANODE All component values are nominal. 2 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 TL431, TL431A ADJUSTABLE PRECISION SHUNT REGULATORS SLVS005L - JULY 1978 - REVISED AUGUST 2000 absolute maximum ratings over operating free-air temperature range (unless otherwise noted) Cathode voltage, VKA (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 V Continuous cathode current range, IKA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -100 mA to 150 mA Reference input current range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -50 A to 10 mA Package thermal impedance, JA (see Notes 2 and 3): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97C/W DBV package . . . . . . . . . . . . . . . . . . . . . . . . . 206C/W KTP package . . . . . . . . . . . . . . . . . . . . . . . . . . 28C/W LP package . . . . . . . . . . . . . . . . . . . . . . . . . . 156C/W P package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85C/W PK package . . . . . . . . . . . . . . . . . . . . . . . . . . . 52C/W PW package . . . . . . . . . . . . . . . . . . . . . . . . . . 149C/W Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: D, P, or PW package . . . . . . . . . . . . 260C Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: LP or PK package . . . . . . . . . . . . . . 300C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65C to 150C Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES: 1. Voltage values are with respect to the anode terminal unless otherwise noted. 2. Maximum power dissipation is a function of TJ(max), JA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) - TA)/JA. Operating at the absolute maximum TJ of 150C can affect reliability. 3. The package thermal impedance is calculated in accordance with JESD 51. recommended operating conditions MIN Cathode voltage, VKA Cathode current, IKA Operating free-air temperature range, TA free air range TL431C, TL431AC TL431I, TL431AI Vref 1 0 -40 MAX 36 100 70 85 UNIT V mA C POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 3 TL431, TL431A ADJUSTABLE PRECISION SHUNT REGULATORS SLVS005L - JULY 1978 - REVISED AUGUST 2000 electrical characteristics over recommended operating conditions, TA = 25C (unless otherwise noted) PARAMETER Vref VI(dev) Reference voltage Deviation of reference voltage over full temperature range (see Figure 1) Ratio of change in reference voltage g g to the change in cathode voltage Reference current Deviation of reference current over full temperature range (see Figure 1) Minimum cathode current for regulation Off-state cathode current Dynamic impedance (see Figure 1) TEST CIRCUIT 2 2 TEST CONDITIONS VKA = Vref, IKA = 10 mA TL431C MIN 2440 TYP 2495 4 -1.4 -1 2 0.4 MAX 2550 25 -2.7 -2 4 1.2 UNIT mV mV VKA = Vref, IKA = 10 mA, TA = 0C to 70C IKA = 10 mA VKA = 10 V - Vref VKA = 36 V - 10 V DVref DVKA Iref II(dev) Imin Ioff |zKA| 3 3 3 mV V A A IKA = 10 mA, R1 = 10 k, R2 = IKA = 10 mA, R1 = 10 k, R2 = , TA = 0C to 70C VKA = Vref VKA = 36 V, Vref = 0 IKA = 1 mA to 100 mA, VKA = Vref, f 1 kHz 2 4 1 0.4 0.1 0.2 1 1 0.5 mA A The deviation parameters Vref(dev) and Iref(dev) are defined as the differences between the maximum and minimum values obtained over the recommended temperature range. The average full-range temperature coefficient of the reference voltage, Vref, is defined as: aVref ppm C + V I(dev) V at 25C ref 10 6 Maximum Vref VI(dev) Minimum Vref TA DTA where: TA is the recommended operating free-air temperature range of the device. Vref can be positive or negative, depending on whether minimum Vref or maximum Vref, respectively, occurs at the lower temperature. Example: maximum Vref = 2496 mV at 30C, minimum Vref = 2492 mV at 0C, Vref = 2495 mV at 25C, TA = 70C for TL431C aVref + 4 mV 2495 mV 70C 10 6 [ 23 ppm C + DVKA DI Because minimum Vref occurs at the lower temperature, the coefficient is positive. Calculating Dynamic Impedance The dynamic impedance is defined as: z KA KA When the device is operating with two external resistors (see Figure 3), the total dynamic impedance of the circuit is given by: DV z |z | 1 R1 KA DI R2 +[ ) Figure 1. Calculating Deviation Parameters and Dynamic Impedance 4 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 TL431, TL431A ADJUSTABLE PRECISION SHUNT REGULATORS SLVS005L - JULY 1978 - REVISED AUGUST 2000 electrical characteristics over recommended operating conditions, TA = 25C (unless otherwise noted) PARAMETER Vref VI(dev) Reference voltage Deviation of reference voltage over full temperature range (see Figure 1) Ratio of change in reference voltage g g to the change in cathode voltage Reference current Deviation of reference current over full temperature range (see Figure 1) Minimum cathode current for regulation Off-state cathode current Dynamic impedance (see Figure 1) TEST CIRCUIT 2 2 TEST CONDITIONS VKA = Vref, IKA = 10 mA TL431I MIN 2440 TYP 2495 5 -1.4 -1 2 0.8 MAX 2550 50 -2.7 -2 4 2.5 UNIT mV mV VKA = Vref, IKA = 10 mA, TA = -40C to 85C IKA = 10 mA VKA = 10 V - Vref VKA = 36 V - 10 V DVref DVKA Iref II(dev) Imin Ioff |zKA| 3 3 3 mV V A A IKA = 10 mA, R1 = 10 k, R2 = IKA = 10 mA, R1 = 10 k, R2 = , TA = -40C to 85C VKA = Vref VKA = 36 V, Vref = 0 IKA = 1 mA to 100 mA, VKA = Vref, f 1 kHz 2 4 2 0.4 0.1 0.2 1 1 0.5 mA A electrical characteristics over recommended operating conditions, TA = 25C (unless otherwise noted) PARAMETER Vref VI(dev) Reference voltage Deviation of reference voltage over full temperature range (see Figure 1) Ratio of change in reference voltage g g to the change in cathode voltage Reference current Deviation of reference current over full temperature range (see Figure 1) Minimum cathode current for regulation Off-state cathode current Dynamic impedance (see Figure 1) TEST CIRCUIT 2 2 TEST CONDITIONS VKA = Vref, IKA = 10 mA TL431AC MIN 2470 TYP 2495 4 -1.4 -1 2 0.8 MAX 2520 25 -2.7 -2 4 1.2 UNIT mV mV VKA = Vref, IKA = 10 mA, TA = 0C to 70C IKA = 10 mA VKA = 10 V - Vref VKA = 36 V - 10 V DVref DVKA Iref II(dev) Imin Ioff |zKA| 3 3 3 mV V A A IKA = 10 mA, R1 = 10 k, R2 = IKA = 10 mA, R1 = 10 k, R2 = , TA = 0C to 70C VKA = Vref VKA = 36 V, Vref = 0 IKA = 1 mA to 100 mA, VKA = Vref, f 1 kHz 2 4 1 0.4 0.1 0.2 0.6 0.5 0.5 mA A POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 5 TL431, TL431A ADJUSTABLE PRECISION SHUNT REGULATORS SLVS005L - JULY 1978 - REVISED AUGUST 2000 electrical characteristics over recommended operating conditions, TA = 25C (unless otherwise noted) PARAMETER Vref VI(dev) Reference voltage Deviation of reference voltage over full temperature range (see Figure 1) Ratio of change in reference voltage g g to the change in cathode voltage Reference current Deviation of reference current over full temperature range (see Figure 1) Minimum cathode current for regulation Off-state cathode current Dynamic impedance (see Figure 1) TEST CIRCUIT 2 2 TEST CONDITIONS VKA = Vref, IKA = 10 mA TL431AI MIN 2470 TYP 2495 5 -1.4 -1 2 0.8 MAX 2520 50 -2.7 -2 4 2.5 UNIT mV mV VKA = Vref, IKA = 10 mA, TA = -40C to 85C IKA = 10 mA VKA = 10 V - Vref VKA = 36 V - 10 V DVref DVKA Iref II(dev) Imin Ioff |zKA| 3 3 3 mV V A A IKA = 10 mA, R1 = 10 k, R2 = IKA = 10 mA, R1 = 10 k, R2 = , TA = -40C to 85C VKA = Vref VKA = 36 V, Vref = 0 IKA = 1 mA to 100 mA, VKA = Vref, f 1 kHz 2 4 2 0.4 0.1 0.2 0.7 0.5 0.5 mA A electrical characteristics over recommended operating conditions, TA = 25C (unless otherwise noted) PARAMETER Vref Reference voltage Ratio of change in reference voltage g g to the change in cathode voltage Reference input current Minimum cathode current for regulation Off-state cathode current Dynamic impedance TEST CIRCUIT 2 3 3 2 4 2 TEST CONDITIONS VKA = Vref, IKA = 10 mA IKA = 10 mA VKA = 10 V - Vref TL431Y MIN TYP 2495 -1.4 -1 2 0.4 0.1 0.2 MAX UNIT mV mV V A mA A DVref DVKA Iref Imin Ioff |zKA| VKA = 36 V - 10 V IKA = 10 mA, R1 = 10 k, R2 = VKA = Vref VKA = 36 V, Vref = 0 IKA = 1 mA to 100 mA, VKA = Vref, f 1 kHz Calculating dynamic impedance: The dynamic impedance is defined as: z KA + DV DI KA KA When the device is operating with two external resistors (see Figure 3), the total dynamic impedance of the circuit is given by: |z | + V [ | z I KA |1 ) R1 R2 6 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 TL431, TL431A ADJUSTABLE PRECISION SHUNT REGULATORS SLVS005L - JULY 1978 - REVISED AUGUST 2000 PARAMETER MEASUREMENT INFORMATION Input IKA VKA Vref Figure 2. Test Circuit for VKA = Vref Input IKA R1 Iref VKA R2 Vref V KA +V ref 1 ) R1 ) I R2 ref R1 Figure 3. Test Circuit for VKA > Vref Input Ioff VKA Figure 4. Test Circuit for Ioff POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 7 TL431, TL431A ADJUSTABLE PRECISION SHUNT REGULATORS SLVS005L - JULY 1978 - REVISED AUGUST 2000 TYPICAL CHARACTERISTICS Table 1. Graphs FIGURE Reference input voltage vs Free-air temperature Reference input current vs Free-air temperature Cathode current vs Cathode voltage Off-state cathode current vs Free-air temperature Ratio of delta reference voltage to change in cathode voltage vs Free-air temperature Equivalent input noise voltage vs Frequency Equivalent input noise voltage over a 10-second period Small-signal voltage amplification vs Frequency Reference impedance vs Frequency Pulse response Stability boundary conditions 5 6 7, 8 9 10 11 12 13 14 15 16 Table 2. Application Circuits FIGURE Shunt regulator Single-supply comparator with temperature-compensated threshold Precision high-current series regulator Output control of a three-terminal fixed regulator High-current shunt regulator Crowbar circuit Precision 5-V 1.5-A regulator Efficient 5-V precision regulator PWM converter with reference Voltage monitor Delay timer Precision current limiter Precision constant-current sink 17 18 19 20 21 22 23 24 25 26 27 28 29 8 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 TL431, TL431A ADJUSTABLE PRECISION SHUNT REGULATORS SLVS005L - JULY 1978 - REVISED AUGUST 2000 TYPICAL CHARACTERISTICS REFERENCE VOLTAGE vs FREE-AIR TEMPERATURE 2600 2580 V ref - Reference Voltage - mV 2560 2540 2520 2500 2480 2460 2440 2420 2400 -75 -50 -25 0 25 50 75 100 125 0 -75 -50 -25 0 25 50 75 100 125 Vref = 2440 mV Vref = 2495 mV VKA = Vref IKA = 10 mA 5 Vref = 2550 mV 4 R1 = 10 k R2 = IKA = 10 mA I ref - Reference Current - A REFERENCE CURRENT vs FREE-AIR TEMPERATURE 3 2 1 TA - Free-Air Temperature - C Data is for devices having the indicated value of Vref at IKA = 10 mA, TA = 25C. TA - Free-Air Temperature - C Figure 5 CATHODE CURRENT vs CATHODE VOLTAGE 150 125 I KA - Cathode Current - mA 100 75 50 25 0 -25 -50 -75 -100 -2 -200 -1 0 1 2 3 -1 0 VKA = Vref TA = 25C I KA - Cathode Current - A 600 800 VKA = Vref TA = 25C Figure 6 CATHODE CURRENT vs CATHODE VOLTAGE Imin 400 200 0 1 2 3 VKA - Cathode Voltage - V VKA - Cathode Voltage - V Figure 7 Figure 8 Data at high and low temperatures are applicable only within the recommended operating free-air temperature ranges of the various devices. POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 9 TL431, TL431A ADJUSTABLE PRECISION SHUNT REGULATORS SLVS005L - JULY 1978 - REVISED AUGUST 2000 TYPICAL CHARACTERISTICS RATIO OF DELTA REFERENCE VOLTAGE TO DELTA CATHODE VOLTAGE vs FREE-AIR TEMPERATURE - 0.85 VKA = 36 V Vref = 0 2 V ref / V KA - mV/V -1.05 VKA = 3 V to 36 V - 0.95 OFF-STATE CATHODE CURRENT vs FREE-AIR TEMPERATURE 2.5 I off - Off-State Cathode Current - A 1.5 -1.15 1 -1.25 0.5 -1.35 0 -75 -50 -25 0 25 50 75 100 125 -1.45 -75 -50 -25 0 25 50 75 100 125 TA - Free-Air Temperature - C TA - Free-Air Temperature - C Figure 9 EQUIVALENT INPUT NOISE VOLTAGE vs FREQUENCY 260 Vn - Equivalent Input Noise Voltage - nV/ Hz 240 220 200 180 160 140 120 100 10 100 1k f - Frequency - Hz 10 k 100 k IO = 10 mA TA = 25C Figure 10 Figure 11 Data at high and low temperatures are applicable only within the recommended operating free-air temperature ranges of the various devices. 10 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 TL431, TL431A ADJUSTABLE PRECISION SHUNT REGULATORS SLVS005L - JULY 1978 - REVISED AUGUST 2000 TYPICAL CHARACTERISTICS EQUIVALENT INPUT NOISE VOLTAGE OVER A 10-SECOND PERIOD 6 V n - Equivalent Input Noise Voltage - V 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 0 19.1 V 1 k 1 2 3 4 5 6 7 8 9 10 t - Time - s f = 0.1 to 10 Hz IKA = 10 mA TA = 25C 500 F 910 2000 F VCC 1 F VCC To Oscilloscope TL431 (DUT) 820 16 160 k 0.1 F + - TLE2027 AV = 10 V/mV + 16 k 16 k 1 F 33 k AV = 2 V/V 33 k - TLE2027 22 F VEE VEE Figure 12. Test Circuit for Equivalent Input Noise Voltage POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 11 TL431, TL431A ADJUSTABLE PRECISION SHUNT REGULATORS SLVS005L - JULY 1978 - REVISED AUGUST 2000 TYPICAL CHARACTERISTICS SMALL-SIGNAL VOLTAGE AMPLIFICATION vs FREQUENCY 60 A V - Small-Signal Voltage Amplification - dB IKA = 10 mA TA = 25C 50 15 k 40 9 F + 30 8.25 k 20 - IKA Output 232 GND 10 TEST CIRCUIT FOR VOLTAGE AMPLIFICATION 0 1k 10 k 100 k f - Frequency - Hz 1M 10 M Figure 13 REFERENCE IMPEDANCE vs FREQUENCY 100 IKA = 10 mA TA = 25C 1 k Output 10 50 - + 1 GND IKA |z KA | - Reference Impedance - TEST CIRCUIT FOR REFERENCE IMPEDANCE 0.1 1k 10 k 100 k 1M 10 M f - Frequency - Hz Figure 14 12 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 TL431, TL431A ADJUSTABLE PRECISION SHUNT REGULATORS SLVS005L - JULY 1978 - REVISED AUGUST 2000 TYPICAL CHARACTERISTICS PULSE RESPONSE 6 TA = 25C Input 5 Input and Output Voltage - V 220 Output 4 Pulse Generator f = 100 kHz Output GND 50 3 2 1 TEST CIRCUIT FOR PULSE RESPONSE 0 -1 0 1 2 3 4 5 6 7 t - Time - s Figure 15 STABILITY BOUNDARY CONDITIONS 100 90 I KA - Cathode Current - mA 80 70 Stable 60 Stable 50 A 40 30 D 20 10 0 0.001 0.01 0.1 1 10 CL C A VKA = Vref B VKA = 5 V C VKA = 10 V D VKA = 15 Vf B TA = 25C 150 IKA + CL VBATT - TEST CIRCUIT FOR CURVE A IKA R1 = 10 k 150 + R2 - CL - Load Capacitance - F VBATT The areas under the curves represent conditions that may cause the device to oscillate. For curves B, C, and D, R2 and V+ were adjusted to establish the initial VKA and IKA conditions with CL = 0. VBATT and CL were then adjusted to determine the ranges of stability. TEST CIRCUIT FOR CURVES B, C, AND D Figure 16 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 13 TL431, TL431A ADJUSTABLE PRECISION SHUNT REGULATORS SLVS005L - JULY 1978 - REVISED AUGUST 2000 APPLICATION INFORMATION R (see Note A) VI(BATT) R1 0.1% Vref R2 0.1% RETURN NOTE A: R should provide cathode current 1 mA to the TL431 at minimum VI(BATT). TL431 VO VO + 1 ) R1 V R2 ref Figure 17. Shunt Regulator VI(BATT) TL431 Input VIT 2.5 V VO Von 2 V Voff VI(BATT) GND Figure 18. Single-Supply Comparator With Temperature-Compensated Threshold VI(BATT) R (see Note A) 30 0.01 F TL431 R2 0.1% R1 0.1% 4.7 k VO VO 2N222 2N222 + 1 ) R1 V R2 ref NOTE A: R should provide cathode current 1 mA to the TL431 at minimum VI(BATT). Figure 19. Precision High-Current Series Regulator 14 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 TL431, TL431A ADJUSTABLE PRECISION SHUNT REGULATORS SLVS005L - JULY 1978 - REVISED AUGUST 2000 APPLICATION INFORMATION VI(BATT) IN uA7805 Common TL431 R2 OUT R1 VO VO + 1 ) R1 V R2 Minimum V + V ) 5 V ref O ref Figure 20. Output Control of a Three-Terminal Fixed Regulator VI(BATT) R1 VO VO R2 TL431 + 1 ) R1 V R2 ref Figure 21. High-Current Shunt Regulator VI(BATT) R1 TL431 C (see Note A) VO R2 NOTE A: Refer to the stability boundary conditions in Figure 16 to determine allowable values for C. Figure 22. Crowbar Circuit POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 15 TL431, TL431A ADJUSTABLE PRECISION SHUNT REGULATORS SLVS005L - JULY 1978 - REVISED AUGUST 2000 APPLICATION INFORMATION VI(BATT) IN 8.2 k LM317 OUT VO 5 V, 1.5 A 243 0.1% Adjust TL431 243 0.1% Figure 23. Precision 5-V 1.5-A Regulator VI(BATT) Rb (see Note A) VO 5 V 27.4 k 0.1% TL431 27.4 k 0.1% NOTE A: Rb should provide cathode current 1 mA to the TL431. Figure 24. Efficient 5-V Precision Regulator 12 V 6.8 k 5V 10 k VCC - 10 k 0.1% + X Not Used TL598 TL431 10 k 0.1% Feedback Figure 25. PWM Converter With Reference 16 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 TL431, TL431A ADJUSTABLE PRECISION SHUNT REGULATORS SLVS005L - JULY 1978 - REVISED AUGUST 2000 APPLICATION INFORMATION R3 (see Note A) VI(BATT) R1A TL431 R1B R4 (see Note A) Low Limit + 1 ) R1B V R2B High Limit + 1 ) R1A V R2A ref ref R2A R2B LED on When Low Limit < VI(BATT) < High Limit NOTE A: R3 and R4 are selected to provide the desired LED intensity and cathode current 1 mA to the TL431 at the available VI(BATT). Figure 26. Voltage Monitor 12 V R 650 2 k TL431 Delay +R C In 12 V 12 V V ref * Off On C Figure 27. Delay Timer VI(BATT) R1 RCL 0.1% IO I out R1 V +R )I ref CL KA TL431 + V I(BATT) O h FE I )I KA Figure 28. Precision Current Limiter POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 17 TL431, TL431A ADJUSTABLE PRECISION SHUNT REGULATORS SLVS005L - JULY 1978 - REVISED AUGUST 2000 APPLICATION INFORMATION VI(BATT) IO IO TL431 RS 0.1% +V R ref S Figure 29. Precision Constant-Current Sink 18 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Customers are responsible for their applications using TI components. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof. Copyright (c) 2000, Texas Instruments Incorporated |
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